CASE expression

A conditional expression that can be used to evaluate multiple expressions and return a result.

Syntax

     CASE
        WHEN condition THEN result
        [ ...n ]
        [ ELSE result ]
     END

[ ] marks optional components

Arguments

WHEN condition - The condition expression to evaluate.
THEN result - If condition evaluates to True then result is evaluated and returned.
ELSE result - If none of the above conditions evaluated to True then result is evaluated and returned.

Example

    CASE
        WHEN "column" IS NULL THEN 'None'
    END